C# can not find executable

Question

In a C# 2008 application, I am having the program execute another C# 2008 application. I am getting the error message, "The system cannot find the file specified".

Thus the second program is not located.

To solve this problem, where should the executable be located for the first program to find it?

In the deployment package, do I need to place the executable in the same directory path as where the main program is located at?